TWI593241B - Power compensation in multi-carrier transmitters - Google Patents

Description

Power compensation in multi-carrier transmitters

The disclosure of the present invention is generally related to power compensation in a multicarrier transmitter, and more particularly to compensation of carrier power imbalance and total carrier power in a multi-carrier transmitter.

In the Dual-Carrier Enhanced Dedicated Channel (E-DCH) standard, such as the 3rd Generation Partnership Project (3GPP) (also known as dual-carrier high-speed uplink packet storage) In a multi-carrier transmitter such as a multi-carrier transmitter (Dual Carrier High Speed Uplink Packet Access; DC-HSUPA), if the sum of the powers of the multiple carriers is input to a single power amplifier, the RF circuit should It is designed to tolerate a specific range of carrier power imbalances. The ability to handle a wide range of carrier power imbalances between multiple carriers is impractical and expensive. On the other hand, designs that can only accommodate mid-range carrier power imbalances may result in undesirable in-band interference that would degrade signal transmission quality.

200‧‧‧Transmitter

210‧‧‧ fundamental frequency

220‧‧‧RF/IF

230‧‧‧Antenna

212‧‧‧ Frequency shifter

214‧‧‧gain controller

216‧‧‧ Locator

218‧‧‧Scale Factor Estimator

2122‧‧‧First frequency shifter

2124‧‧‧Second frequency shifter

2142‧‧‧First gain/attenuation stage

2144‧‧‧second gain/attenuation stage

222‧‧‧ combiner

224‧‧‧Upconverter

226‧‧Amplifier

600‧‧‧Wireless communication system

610‧‧‧First wireless communication device

620‧‧‧Second wireless communication device

Figure 1 shows a graph of the power versus the frequency of the first and second carriers.

Figure 2 shows a schematic diagram of a transmitter for transmitting a communication signal.

Figure 3A shows a graph of the ratio of the stronger carrier power to the ratio of the weaker carrier power, showing three examples based on a maximum total power demand.

Figure 3B shows a graph of the ratio of the stronger carrier power to the weaker carrier power, and two examples based on a maximum power imbalance requirement are shown.

Figure 4A shows a graph of the ratio of the stronger carrier power to the ratio of the weaker carrier power, and an example based on a maximum total power demand is shown.

Figure 4B shows a graph of the ratio of the stronger carrier power to the ratio of the weaker carrier power, and an example based on a maximum power imbalance requirement is shown.

Figure 5 shows a graph of the ratio of the stronger carrier power to the weaker carrier power, showing an example based on a maximum total power demand and a maximum power imbalance requirement.

Figure 6 shows a schematic diagram of a wireless communication system.

Figure 7 shows a flow chart of a method for transmitting a communication signal.

SUMMARY OF THE INVENTION AND EMBODIMENT

The disclosure of the present invention relates to multi-carrier transmission compensation applied to the physical layer for maintaining carrier power imbalance and total carrier power simultaneously within an acceptable range without sacrificing transmitter and system performance.

Figure 1 shows a graph 100 of power versus frequency for the first and second carriers in a multi-carrier transmission. These graphics are for illustrative purposes and are not meant to be mathematically accurate.

"Carrier" is a frequency used to transmit information. Information is typically generated at a fundamental frequency that is low frequency and cannot be used for transmission. The center frequency of the baseband signal is thus increased to the higher frequency used for transmission. This higher frequency is called a carrier. In multi-carrier transmission, as shown in the example of FIG. 1 for two carriers, a set of baseband information is added to a first carrier, and another set of baseband information is added to a second carrier. ..and many more. The two sets of information on the first and second carriers, respectively, may be transmitted in parallel. The disclosure of the present invention is not limited to multi-carrier transmission with two carriers, but may include any number of carriers suitable for the intended use.

For example, the DC-HSUPA combines the first and second carriers into a larger data transmission, and the larger data transmission has a joint scheduling of upstream traffic across the two carriers. DC-HSUPA allows mobile devices to utilize the available instantaneous capacity on any carrier. The benefit is a significant increase in the amount of data being transmitted, resulting in higher system capacity.

Ideally, the transmission on the carrier is limited to a specific frequency range. It does not cause interference to adjacent bands/carriers. However, in reality, as indicated by the shaded box in Fig. 1, there must be interference with adjacent frequency bands or carriers. The "in-band interference" shown in this figure is the interference that affects the adjacent carriers of the same transmitter, which is different from the "out-of-band interference" that affects the interference of adjacent carriers of different transmitters ("out- Of-band interference").

Figure 1 shows the case where the power of the second carrier is similar to the power of the first carrier. In this case, the interference is not significant and can be ignored. On the other hand, Fig. 1 shows the case where the power of the first carrier is relatively lower than the power of the second carrier. In this case, the interference level of the stronger carrier to the weaker carrier is significant.

As will be explained in more detail below, the disclosure of the present invention relates to adjusting carrier power in a multi-carrier transmitter using two parameters: (1) maximum power imbalance; and (2) maximum total transmission power.

The maximum allowable power imbalance P _imb,max is the ratio of the stronger carrier power to the weaker carrier power and is based on the maximum allowable in-band interference level. This value is determined by the design.

The maximum carrier power P _{T, max} is the maximum total power that can be used for signal transmission, the carrier and determining the maximum power P _{T, max} power capability of the transmitter (power capability). This value is shown in the upper horizontal line in Fig. 1. "Granting" is the maximum available power for data transmission at a particular time for a particular carrier. For example, in DC-HSUPA, the Medium Access Control (MAC) layer grants the service grant of the first and second carriers and the non-scheduled grant of the first carrier to determine the upper limit of the available power for transmission. When the amount of information available on a carrier is less than the amount indicated by the corresponding power cap, a portion of the available power on that carrier is still unused. The MAC layer can utilize an unused power budget to reduce power imbalance by an algorithm applied on the physical layer.

Figure 2 shows a schematic diagram of a transmitter 200 for transmitting a communication signal having at least a first carrier and a second carrier. The transmitter can be designed in accordance with the 3GPP DC-HSUPA standard, but the disclosure of the present invention is not limited in this respect. Transmitter 200 can be designed in accordance with any multi-carrier standard.

The transmitter 200 includes a baseband 210, a radio frequency (RF)/intermediate frequency (IF) 220, and an antenna 230.

The baseband 210 includes a frequency shifter 212, a gain controller 214, a locator 216, and a scaling factor estimator 218. By way of overview, the frequency shifter 212 is configured to shift the two baseband data streams S _L , S _H from the base frequency to a higher frequency, and the locator 216 is configured to be adjusted according to power and to be available with maximum and minimum In a power-dependent manner, a position on a map of a power adjustment map corresponding to uncompensated carrier power is determined on a map relative to a limit corresponding to the maximum and minimum power available to each carrier, and the scaling factor estimator 218 is configured to The power scaling factors x, y of the first and second carriers are estimated, and the gain controller 214 is configured to adjust the power of the shifted first and second carriers in accordance with the equal power scaling factors x, y. A more detailed explanation will be provided below.

The frequency shifter 212 includes a first frequency shifter 2122 and a second frequency shifter 2124. The first frequency shifter 2122 is configured to receive the baseband signal S _L as an input and to shift the signal by a frequency amount -Δω. The second frequency shifter 2124 is configured to receive the baseband signal _SH as an input and to shift the signal by a frequency amount + Δω. The fundamental frequency signals S _L and S _{H are} thus moved by a distance Δω on either side of the direct current (0 frequency). The baseband signals S _L and S _H contain information to be transmitted, and the information may be voice, video, data, and the like.

As will be explained below in relation to Figures 3A, 3B, 4A, 4B, and 5, the locator 216 is configured to be determined in a manner related to the limits of the maximum and minimum power available for each carrier. A position corresponding to a point on the power adjustment map of the uncompensated carrier power. In these figures, the x and y axes are power scaling factors, not actual power. The locator 216 is configured to receive a weaker carrier power P _L , a stronger carrier power P _H , a minimum ratio x _min of the weaker carrier power, a maximum ratio x _{max of} the weaker carrier power, the stronger carrier power The minimum ratio y _min and the maximum ratio y _{max of} the stronger carrier power are taken as inputs. In the case of DC-HSUPA, x _min , x _max , y _min , and y _{max are} set by the higher layers. The weaker carrier power P _L and the stronger carrier power P _H are the powers of the first and second signals, respectively, and the power is determined immediately.

The scaling factor estimator 218 located in the physical layer is configured to be estimated according to the following equation to avoid exceeding the maximum transmitter power P _T,max and the maximum power imbalance P _imb,max power scaling factor: y x. P _L /P _H +P _T,max (Equation 1a - Total carrier power requirement)

Total carrier power = x. P _L +y. P _H (Equation 1b)

y x. P _imb,max . P _L /P _H , and (Equation 2a - Carrier Power Unbalance Demand) Carrier Power Imbalance = y. P _H /x. P _L (Equation 2b)

Where P _L is the power of the first or second carrier with lower power, and P _H is the power of the first or second carrier with higher power, P _T,max is the maximum transmission power, and P _imb,max is the maximum power Unbalanced, x is the ratio applied to the weaker carrier, and y is the ratio applied to the stronger carrier.

Equation 1a is used to ensure that the sum of the proportional powers of the two carriers (x.P _L +y.P _H ) is not greater than the maximum transmission power P _T,max . Initially, the information used to determine the values of P _L and P _H may not be accurate prior to data transmission. When closer to the transmission time, it is determined whether the sum of the powers of the two carriers exceeds the maximum allowable transmission power P _T,max . If the sum does not exceed the maximum allowable transmission power P _T,max , the scaling factors (x and y) of the two carrier powers (P _L and P _H ) remain equal to one. On the other hand, if the sum exceeds the maximum allowable transmission power P _T,max , the scaling factors x and y are used to scale down the carrier power (where x is used for P _L and y is used for P _H ) to reduce the total carrier power to xP _L +yP _H .

Equation 2a is used to ensure that the power imbalance between the proportional powers of the two carriers does not exceed the maximum allowable carrier imbalance P _imb,max .

Initially, before applying the power ratio, the value of x is equal to 1, and is in the range of x _min to x _max , and as such, the value of y is equal to 1, and is in the range of y _min to y _max . These values are set by the higher layers. As we know, there are different transmission control layers. The first layer is the physical layer that represents the hardware. The layer above the physical layer includes a MAC layer that is a control layer and a network layer that communicates with the network to transmit information to lower layers (MAC layer and physical layer). The x _max and y _{max are} determined by the grant. Grant is the maximum power transfer on each carrier. For example, in DC-HSUPA, a grant is received from the network.

Gain controller 214, also located in the physical layer, includes a first gain/attenuation stage 2142 and a second gain/attenuation stage 2144. The first stage 2142 is configured to amplify/attenuate the weaker carrier (ie, the frequency shifted baseband signal S _L ). PL/P _T . The second stage 2144 is configured to amplify/attenuate the stronger carrier (ie, the frequency shifted baseband signal S _H ). P _L /P _T . x is the ratio applied to the weaker carrier, y is the ratio applied to the stronger carrier, P _L is the weaker carrier power, P _H is the stronger carrier power, and P _T is the weaker and stronger The total power of the carrier.

Perform carrier power adjustment before transmitting the communication signal. These adjustments can be performed as needed; these adjustments are performed for each time slot in the DC-HSUPA example, but the disclosure of the present invention is not limited in this respect. These adjustments can be performed periodically or non-periodically. Transmission and reception are divided into time units that are frames. In the DC-HSUPA example, the frame is 10 milliseconds. The frame is subdivided into time slots, and for DC-HSUPA, there are 15 time slots in the frame. For the DC-HSUPA example, these calculations are performed on a time slot basis.

The RF/IF 220 includes a combiner 222, an upconverter 224, and an amplifier 226. These components are well known. Combiner 222 is configured to combine the first and second carriers of the adjusted power. The upconverter 224 is configured to upconvert the combined first and second carriers to a higher frequency. Amplifier 226 is configured to first amplify the upconverted combined first and second carriers, and then transmit, by antenna 230, a communication signal comprising the upconverted first and second carriers.

3A, 3B, 4A, 4B, and 5 illustrate graphs of a stronger carrier power ratio (y-axis) versus a weaker carrier power ratio (x-axis), and illustrate the above-described decision for determination in a visual manner. The solutions of equations 1a and 2a that modify the scaling factor of these carrier powers.

In these figures, line d1 determines the need for power ratio. Line d2 determines the demand for power ratio. D5 representative of the power line carrier weaker minimum ratio x _min, and weak lines d6 representative of the maximum carrier power ratio x _max. Line d8 represents the minimum ratio y _min of the stronger carrier power, and line d7 represents the maximum ratio y _{max of the} stronger carrier power. Point R = 1, 1 represents the initial value of the carrier powers before the ratio is applied (i.e., when x = 1 and y = 1). For example, in the E-DPDCH, the lines d5 and d8 are set by the higher layers, and the lines d6 and d7 are calculated by the MAC layer in accordance with the grant.

The position of point R relative to line d1 indicates whether a carrier power ratio is required. If the point R is to the right of the line d1, the maximum allowable transmission power P _T,max is exceeded, thus indicating the demand for the power ratio. The line d1 is represented by the following equation: Line d1: y = x. P _L /P _H +P _T,max (Equation 1c).

The position of point R relative to line d2 indicates whether carrier power balancing is required. If the point R is to the left of the line d2, the maximum allowable power imbalance P _imb,max is exceeded, thus indicating the need for power balance. The quality of the signal of the transmitter 200 is reduced, but the quality of the adjacent out-of-band signal is not degraded. The line d2 is represented by the following equation: Line d2: y = x. P _imb,max . P _L /P _H (Equation 2c).

Point R is always within the rectangle defined by lines d5, d6, d7, and d8 ("d5-d6-d7-d8 rectangle"). In order to satisfy Equation 1a (maximum carrier power requirement) and Equation 2a (carrier power imbalance requirement), the point R should be within the lines d1 and d2 and the triangle defined by the x-axis ("d1-d2 triangle"), ie, located The maximum total power P _T,max is within the boundary of the maximum power imbalance P _imb,max . If the point R is outside the d1-d2 triangle, one or more carrier powers are compensated to move the point R to be within the d1-d2 triangle or at least on the boundary of the d1-d2 triangle. This compensation solves two problems. First, the ratio of the carrier power is applied, i.e., the point R is shifted, so that the sum of the carrier powers does not exceed the maximum total power P _T,max . At the same time, the scale values x, y can be adjusted in different directions (i.e., to increase one carrier power and/or reduce another carrier power), thus not exceeding the maximum power imbalance P _imb,max .

The degree of compensation for the carrier power depends on the relative positions of the d1-d2 triangle and the d5-d6-d7-d8 rectangle, and also on the initial position of the point R relative to the two regions. If the d1-d2 triangle overlaps the d5-d6-d7-d8 rectangle and the point R is within the overlap, no power modification is required. If the d1-d2 triangle overlaps the d5-d6-d7-d8 rectangle, but the point R is not within the overlap, the point R is moved to a point on line d1 or line d2. If the d1-d2 triangle does not overlap the d5-d6-d7-d8 rectangle, the point R is moved along the direction of the d1-d2 triangle to a new position on a boundary of the d5-d6-d7-d8 rectangle.

There are two criteria to consider when moving the point R to be within the d1-d2 triangle or the d1-d2 triangle. A criterion is the minimum distance between the initial position of R that will result in a minimum modification of the carrier power and the new location. in In this case, there will be a minimum amount of change applied. In order to avoid degradation of the received signal quality, the attenuation of the carrier power should be kept to a minimum.

An alternative to the criteria used by the 3GPP proportional program is to follow the position of the point R relative to the line d1 or the line d2 (depending on which line is closest), first along the direction of the nearest line d1 or d2. The point R is moved parallel to one axis, and if necessary, the point R is moved parallel to the other axis to move the point R onto the line d1 or the line d2, or to move the point R as close as possible to the line d1 or the line d2. Unlike the procedure outlined in the 3GPP specifications, modifications of the invention may be performed in one step rather than in two steps. If there is no overlap between the d1-d2 triangle and the d5-d6-d7-d8 rectangle, the shortest distance between the point R and the line d1 or between the point R and the line d2 can be used as the new position of the selection point R. The determining factor of time.

More specific examples relating to Figures 3A, 3B, 4A, 4B, and 5 will now be described.

Figure 3A shows a graph of a stronger carrier power ratio (y-axis) versus a weaker carrier power ratio (x-axis), with three examples (three points labeled "R"), where A ratio is applied to the carrier powers to satisfy the maximum total power P _T,max demand (Equation 1a; line d1). Each of these three examples involves the case where the point R is initially located to the right of the line d1 and the lower left corner of the d5-d6-d7-d8 rectangle (point A) is within the d1-d2 triangle. Since each point R is located to the right of the line d2, there is no problem of carrier power imbalance. In these examples, the weaker carrier power P _L and the stronger carrier power P _H are both compensated to be weaker using the scaling factors x, y to move the point R to the point R _s on the line d1 (applied proportional) Point R), and thus meets the maximum total power P _T,max demand.

Figure 3B shows a graph of a stronger carrier power ratio (y-axis) versus a weaker carrier power ratio (x-axis), two examples (two points labeled "R"), where A ratio is applied to the carrier powers to satisfy the maximum power imbalance P _imb,max demand (Equation 2a; Line d2). Each of these two examples involves the case where the point R is to the left of the line d2 and the lower right corner of the d5-d6-d7-d8 rectangle (point D) is within the d1-d2 triangle. Since each point R is located to the left of line d1, there is no problem with the maximum total power P _T,max . In the example shown by point R located higher on the y-axis, the stronger carrier power P _{H is} reduced and the weaker carrier power P _{L is} increased to move the point R to the point R _s on line d2 ( The proportional point R) is applied, and thus the maximum power imbalance P _imb,max demand is met. In the example shown at point R located lower on the y-axis, the stronger carrier power P _{H is} kept constant, and the weaker carrier power P _{L is} increased to move the point R to the point R on line d2. _s (the point R to which the proportional is applied), and thus meets the maximum power imbalance P _imb,max requirement.

Figure 4A shows a graph of a stronger carrier power ratio (y-axis) versus a weaker carrier power ratio (x-axis), an example of which is shown in which a ratio is applied to the carrier power to satisfy the maximum total power. P _T,max demand (equation 1a; line d1). The point A of the d5-d6-d7-d8 rectangle is outside the d1-d2 triangle (that is, there is no overlap between the rectangle and the triangle). At the point R, the search for the closest point on line d1 is unsuccessful, thus indicating that a solution to the maximum total power P _T,max requirement is not fully met. In this particular case, the minimum carrier power ratio limits _xmin and _{ymin are} not allowed to adjust from point R to a position on line d1. However, the suboptimal solution moves point R to a position as close as possible to line d1. Point A provides the smallest possible modification to the carrier power level. An additional proportional step can be used to apply a later stage of the ratio to the overall signal to limit the total power to the maximum allowable total power P _T,max .

Figure 4B shows a graph of a stronger carrier power ratio (y-axis) versus a weaker carrier power ratio (x-axis), an example of which is shown in which a ratio is applied to the carrier power to satisfy the maximum power. Balance P _imb,max demand (Equation 2a; line d2). This example indicates a power imbalance problem because the point R is to the left of the line d2 (power imbalance). This power imbalance cannot be completely eliminated because the triangle does not overlap the rectangle without the available path from point R to a position of line d2. The minimum carrier power ratio y _min of the stronger carrier power P _H represented by the line d8 and the maximum carrier power ratio x _max of the weaker carrier power P _L represented by the line d6 result in the selection point D as the best possible solution. In this example, the stronger carrier power P _{H is} reduced and the weaker carrier power P _{L is} increased to shift the point R to point R _s and as close as possible to meet the maximum power imbalance P _imb,max demand.

Figure 5 shows a graph of the ratio of the stronger carrier power (y-axis) to the ratio of the weaker carrier power (x-axis), an example is shown in which a ratio is applied to the carrier power to satisfy the maximum total power. P _T,max demand (equation 1a; line d1) and maximum power imbalance P _imb,max demand (equation 2a; line d2). In the case of this example, line d8 (the minimum carrier power ratio y _{min of the} stronger carrier power P _H ) is above the intersection Q of lines d1 and d2. There is no overlap between the d5-d6-d7-d8 rectangle and the d1-d2 triangle, so the point R is not moved to the position on the line d1 or the line d2 of the d1-d2 triangle, and thus the solution that completely satisfies the requirements is not satisfied. . In this particular case, the minimum carrier power ratio y _min on line d8 does not allow the point R to be moved to a position on line d1 or line d2. However, the intersection Q of lines d3 and d8 provides a suboptimal solution that would result in point R being as close as possible to the d1-d2 triangle with the smallest possible modification to the carrier power level. An additional proportional step can be used to apply a proportional ratio to the overall signal to limit the total power to the maximum allowable total power P _T,max demand.

FIG. 6 shows a schematic diagram of a wireless communication system 600. The system 600 includes a first wireless communication device 610 and a second wireless communication device 620 that are capable of wireless communication with each other. Each of the first wireless communication device 610 and the second wireless communication device 620 includes a transmitter 200 and a receiver 612, 622 of FIG. 2, respectively.

Figure 7 shows a flow diagram 700 of a method of transmitting a communication signal having at least a first carrier and a second carrier. The communication signal can be any multi-carrier signal such as a DC-HSUPA communication signal.

In step 710, a scaling factor estimator 218 estimates one of the first carrier first power scaling factor x and one of the second carrier second power scaling factor y in the manner previously described. In this example, the first carrier is a carrier having a lower carrier power P _L and the second carrier is a carrier having a higher carrier power P _H .

In step 720, a gain controller 214 adjusts the power of the first carrier according to the first power scaling factor x and adjusts at least one of the power of the second carrier according to the second power scaling factor y. As described above, the sum of the adjusted powers of the first and second carriers is less than or equal to a maximum total power P _T,max requirement, and the adjusted powers of the first and second carriers are The power imbalance is less than or equal to a maximum power imbalance P _imb,max demand.

In step 730, a combiner 222 combines the first and second carriers of the adjusted power.

In step 740, an upconverter 224 upconverts the combined first and second carriers.

In step 750, an amplifier 226 amplifies the upconverted combined first and second carriers.

The invention also includes a computer program product embodied on a non-transitory computer readable medium, the computer program product comprising program instructions configured to: when the program instructions are executed by the processing circuit The processing circuit is caused to perform the method of FIG.

The transmitter 200 and corresponding method 700 disclosed herein are less complex than transmitters that reduce power imbalance by modifying the MAC layer. The present invention instead performs power modification in the physical layer without the need to perform modifications by the MAC layer.

Transmitter 200 and method 700 are also more accurate. As described herein, the method is based on parameters that are updated prior to uplink transmission, thus resulting in high accuracy. For example, in the case of DC-HSUPA, power ratio/balance can be achieved by relying on the estimated parameters and by selecting the corresponding transmission data rate. However, before the actual transmission These estimated parameters are generated at a certain time, so these parameters may no longer be valid at the time of transmission, resulting in an inaccurate power ratio/balance.

In addition, transmitter 200 and method 700 ensure operation within the allowable power limits (grants) set by the network. Furthermore, the same algorithm is used to achieve both power imbalance and total carrier power adjustment, and thus the processing time is shorter.

Example 1 is a transmitter for transmitting a communication signal having at least a first carrier and a second carrier, the transmitter comprising: a scaling factor estimator configured to estimate one of the first carriers a power scaling factor and a second power scaling factor of the second carrier; and a gain controller configured to adjust a power of the first carrier according to the first power scaling factor and according to the second Adjusting, by the power scaling factor, at least one of the powers of the second carrier, wherein the sum of the adjusted powers of the first and second carriers is less than or equal to a maximum transmission power, and the first and second carriers The power imbalance between the adjusted powers is less than or equal to a maximum power imbalance.

In Example 2, as the standard of Example 1, the scale factor estimator and the gain controller are included in a physical layer.

In Example 3, as in the example 1, wherein the transmitter is a dual carrier high speed uplink packet access (DC-HSUPA) transmitter.

In Example 4, as in the example 3, wherein the gain controller is further configured to periodically adjust the power of the first and second carriers.

In Example 5, as in the example of Example 3, wherein the gain controller is further configured to non-periodically adjust the power of the first and second carriers.

In Example 6, as in the example 1, the adjustment is performed on the fundamental frequency.

In Example 7, as in the example 1, the maximum power imbalance is determined by the design, and the maximum transmission power is determined by an assignment.

In Example 8, as in the example 1, wherein the scaling factor estimator is further configured to be according to the following equation y x. P _L /P _H +P _T,max and y x. Pi _mb,max . P _L /P _H and estimating a first power scaling factor of the first carrier and a second power scaling factor of the second carrier, wherein x is a first power scaling factor, y is a second power scaling factor, and P _L is power The power of the lower first or second carrier, P _H is the power of the first or second carrier with higher power, P _T,max is the maximum transmission power, and P _imb,max is the maximum power imbalance.

In Example 9, the subject matter of Example 1, further comprising: a combiner configured to combine the first and second carriers having the adjusted power.

In Example 10, the subject matter of Example 9, further comprising: an upconverter configured to upconvert the at least first and second carriers to be combined; and configured to amplify the upconverted combination One of the first and second carriers.

Example 11 is a wireless communication device including the transmitter of Example 1.

Example 12 is a method for transmitting a communication signal having at least a first carrier and a second carrier, the method comprising: estimating, by a scaling factor estimator, a first power scaling factor of the first carrier and the second carrier One a second power scaling factor; and adjusting, by the gain controller, the power of the first carrier according to the first power scaling factor and adjusting the power of the second carrier according to the second power scaling factor, wherein The sum of the adjusted powers of the first and second carriers is less than or equal to a maximum transmission power, and the power imbalance between the adjusted powers of the first and second carriers is less than or equal to a maximum power unbalanced.

In Example 13, as in the subject of Example 12, the estimation and adjustment are performed in a physical layer.

In Example 14, as in the example 12, wherein the communication signal is a dual carrier high speed uplink packet access (DC-HSUPA) communication signal.

In Example 15, as in the example of Example 14, the estimation and adjustment are performed periodically.

In Example 16, as in the example of Example 14, the estimation and adjustment are performed aperiodically.

In Example 17, as in the example 12, wherein the adjustment is performed on the fundamental frequency.

In Example 18, as in the example 12, wherein the maximum power imbalance is determined when a transmitter for performing the transmitting method is manufactured, and the maximum transmission power is determined by an assignment.

In Example 19, as the standard of Example 12, according to the following equation y x. P _L /P _H +P _T,max and y x. P _imb,max . P _L /P _H and estimating a first power scaling factor of the first carrier and a second power scaling factor of the second carrier, wherein x is a first power scaling factor, y is a second power scaling factor, and P _L is power The power of the lower first or second carrier, P _H is the power of the first or second carrier with higher power, P _T,max is the maximum transmission power, and P _imb,max is the maximum power imbalance.

In Example 20, the subject matter of Example 12, further comprising: combining the first and second carriers having the adjusted power by a combiner.

In Example 21, the subject matter of Example 20, further comprising: up-converting the combined first and second carriers by an upconverter; and amplifying the up-combined first and first by an amplifier Two carriers.

Example 22 is a computer program product embodied on a non-transitory computer readable medium, the computer program product comprising program instructions, the program instructions being configured to: when the program instructions are executed by the processing circuit, The processing circuit performs the method as in Example 12.

Example 23 is a transmitter for transmitting a communication signal having at least a first carrier and a second carrier, the transmitter comprising: a scaling factor estimating means for estimating a first power scaling factor of the first carrier and the a second power scaling factor of the second carrier; and a gain control device configured to adjust a power of the first carrier according to the first power scaling factor and adjust a power of the second carrier according to the second power scaling factor At least one of the first and second carriers, the sum of the adjusted powers being less than or equal to a maximum transmission power, and the power between the adjusted powers of the first and second carriers is not The balance is less than or equal to a maximum power imbalance.

In Example 24, the subject matter of Example 23, further comprising: a combination device for combining the first and second loads having the adjusted power wave.

In the example 25, as defined in the example 24, further comprising: an up-converting device for up-converting the combined first and second carriers; and an amplifying device for amplifying the up-combined combined The first and second carriers.

In Example 26, the subject matter of any of Examples 1-6, wherein the maximum power imbalance is determined by design and the maximum transmission power is determined by an assignment.

In Example 27, the subject matter of any of Examples 1-6, wherein the scaling factor estimator is further configured to be according to the following equation y x. P _L /P _H +P _T,max and y x. P _imb,max . P _L /P _H and estimating a first power scaling factor of the first carrier and a second power scaling factor of the second carrier, wherein x is a first power scaling factor, y is a second power scaling factor, and P _L is power The power of the lower first or second carrier, P _H is the power of the first or second carrier with higher power, P _T,max is the maximum transmission power, and P _imb,max is the maximum power imbalance.

In Example 28, the subject matter of any of Examples 1-6, further comprising: a combiner configured to combine the first and second carriers having the adjusted power.

In the example 29, the subject matter of any of the examples 12-17, wherein the maximum power imbalance is determined when a transmitter for performing the transmitting method is manufactured, and the maximum transmission power is determined by a grant.

In Example 30, the subject matter of any of Examples 12-17, wherein according to the following equation y x. P _L /P _H +P _T,max and y x. P _imb,max . P _L /P _H and estimating a first power scaling factor of the first carrier and a second power scaling factor of the second carrier, wherein x is a first power scaling factor, y is a second power scaling factor, and P _L is power The power of the lower first or second carrier, P _H is the power of the first or second carrier with higher power, P _T,max is the maximum transmission power, and P _imb,max is the maximum power imbalance.

In the example 31, the subject matter of any of the examples 12-17, further comprising: combining the first and second carriers having the adjusted power by a combiner.

In the example 32, the subject matter of any of the examples 23-24, further comprising: an up-converting device for up-converting the combined first and second carriers; and an amplifying device for amplifying The up-converted first and second carriers are combined.

Example 33 is an apparatus substantially as shown and described.

Example 34 is a method substantially as shown and described.

Although the foregoing has been described in connection with the illustrative aspects, it should be understood that the term "exemplary" is merely meant to be an example, rather than the best or best example. Therefore, the disclosure of the invention is intended to cover alternatives, modifications, and equivalents, which are included within the scope of the invention.

While certain features have been shown and described in the present specification, it is understood by those of ordinary skill in the art that the invention can be practiced in various alternative and/or equivalent embodiments without departing from the scope of the application. These particular points are shown and described. This application is intended to cover any adaptations or variations of the specific embodiments described herein.

Claims (23)

A transmitter for transmitting a communication signal having at least a first carrier and a second carrier, the transmitter comprising: a scaling factor estimator configured to estimate a first power ratio of the first carrier a factor and a second power scaling factor of the second carrier; and a gain controller configured to adjust a power of the first carrier and a second power scaling factor according to the first power scaling factor And adjusting at least one of the powers of the second carrier, wherein the sum of the adjusted powers of the first and second carriers is less than or equal to a maximum transmission power, and the first and second carriers The power imbalance between the adjusted powers is less than or equal to a maximum power imbalance, wherein the scaling factor estimator is further configured to estimate the first power scaling factor of the first carrier and the second carrier according to the following equation The second power scaling factor: y x. P _L /P _H +P _T,max , and y x. P _imb,max . P _L /P _H , where x is the first power scaling factor, y is the second power scaling factor, P _L is the power of the first or second carrier with lower power, and P _H is higher power The power of the first or second carrier, P _T,max is the maximum transmission power, and P _imb,max is the maximum power imbalance. The transmitter of claim 1, wherein the scale factor estimator and the gain controller are included in a physical layer. The transmitter of claim 1, wherein the transmitter is a dual carrier high speed uplink packet access (DC-HSUPA) transmitter. The transmitter of claim 3, wherein the gain controller is further configured to periodically adjust the power of the first and second carriers. The transmitter of claim 3, wherein the gain controller is further configured to aperiodically adjust the power of the first and second carriers. The transmitter of claim 1, wherein the adjustment is performed on the fundamental frequency. The transmitter of claim 1, wherein the maximum power imbalance is determined by design, and the maximum transmission power is determined by a grant. The transmitter of claim 1, further comprising: a combiner configured to combine the first and second carriers having the adjusted power. The transmitter of claim 8 further comprising: an upconverter configured to upconvert the at least first and second carriers combined; and configured to amplify the upconverted combination One of the first and second carriers. A wireless communication device comprising a transmitter of claim 1 of the patent application. A method for transmitting a communication signal having at least a first carrier and a second carrier, the method comprising: estimating, by a scaling factor estimator, a first power scaling factor of the first carrier and a second of the second carrier a power scaling factor; and adjusting, by the gain controller, the power of the first carrier according to the first power scaling factor and adjusting the power of the second carrier according to the second power scaling factor, wherein the The sum of the adjusted powers of the first and second carriers is less than or equal to a maximum transmission power, and the power imbalance between the adjusted powers of the first and second carriers is less than or equal to a maximum power imbalance Estimating the first power scaling factor of the first carrier and the second power scaling factor of the second carrier according to the following equation: y x. P _L /P _H +P _T,max , and y x. P _imb,max . P _L /P _H , where x is the first power scaling factor, y is the second power scaling factor, P _L is the power of the first or second carrier with lower power, and P _H is higher power The power of the first or second carrier, P _T,max is the maximum transmission power, and P _imb,max is the maximum power imbalance. The method of claim 11, wherein the estimating and adjusting are performed in a physical layer. The method of claim 11, wherein the communication signal is a dual carrier high speed uplink packet access (DC-HSUPA) communication signal. The method of claim 13, wherein the estimating and adjusting are performed periodically. The method of claim 13, wherein the method is non-periodically Perform this estimation and adjustment. The method of claim 11, wherein the adjusting is performed on a fundamental frequency. The method of claim 11, wherein the maximum power imbalance is determined when a transmitter for performing the transmitting method is manufactured, and the maximum transmission power is determined by a grant. The method of claim 11, further comprising: combining the first and second carriers having the adjusted power by a combiner. The method of claim 18, further comprising: up-amplifying the combined first and second carriers by an upconverter; and amplifying the upconverted combined first and second carriers by an amplifier . A computer program product embodied on a non-transitory computer readable medium, the computer program product comprising program instructions, the program instructions being configured to: when the program instructions are executed by the processing circuit, causing the processing circuit to perform The method of applying for the scope of patent item 11. A transmitter for transmitting a communication signal having at least a first carrier and a second carrier, the transmitter comprising: a scaling factor estimating means for estimating a first power scaling factor of the first carrier and the second carrier a second power scaling factor; and a gain control device configured to adjust a power of the first carrier according to the first power scaling factor and adjust at least a power of the second carrier according to the second power scaling factor In one case, the sum of the adjusted powers of the first and second carriers is less than or equal to a maximum transmission power, and the power imbalance between the adjusted powers of the first and second carriers is less than or Equal to a maximum power imbalance, wherein the scaling factor estimator is further configured to estimate the first power scaling factor of the first carrier and the second power scaling factor of the second carrier according to the following equation: y x. P _L /P _H +P _T,max , and y x. P _imb,max . P _L /P _H , where x is the first power scaling factor, y is the second power scaling factor, P _L is the power of the first or second carrier with lower power, and P _H is higher power The power of the first or second carrier, P _T,max is the maximum transmission power, and P _imb,max is the maximum power imbalance. The transmitter of claim 21, further comprising: a combining device for combining the first and second carriers having the adjusted power. The transmitter of claim 22, further comprising: an up-converting device for up-converting the combined first and second carriers; and an amplifying device for amplifying the combined of the up-converted The first and second carriers.